I've been thinking about this for a while, but really once dev sessions turn to focusing on villages/towns again, we might well see some kind of 'war' declaration ability. So, Town 1 would declare war on Town 2, which means both towns are officially at war with eachother, until some kind of peace deal is brokered. There would need to be some kind of meta UI for this, but there are heaps of examples from other games.
Anyway, as I see it, if you belong to a village, and kill a person belonging to a village you are at war with, it should leave no scents. Likewise, if you cause destruction to the village you are at war with.
Because a peace would require the lawspeakers of both sides to consent, a jerk village couldn't declare war, destroy a few things while the other side is offline, and declare peace again, getting away scot free. It would mark a serious commitment to combat.
I guess one major potential for abuse with this is little villages formed by a couple, or even one griefer, who stacks it with alts. There might be other options, but I suggest
: Only villages (or will these become towns in the future?) of 10 players or more can declare war. Also, a town would need to be in existence for a minimum length of time IRL, maybe a week or two? before it can declare war or be declared war on. None of this would stop established towns from stomping on small villages, providing they have had a period of grace. But it would hopefully make it somewhat harder to alt-stack.
Alliances and vassalage could also be worked into the system, which would encourage little weak villages to seek the protection of established towns. A combative town/village would think twice about declaring war on a small village nearby if it knew that it would also automatically be at war with a much larger town down the road.
I think we can expect something along these lines in the future. I certainly hope so!